Minor fixes to Stale Bot (#15184)
Minor fixes to Stale Bot (#15184)

- Update the Stale Issue message
- Rename the workflow to `Close stale PRs & Issues` from `Close stale PRs`
mistercrunch/airflow,cfei18/incubator-airflow,apache/airflow,cfei18/incubator-airflow,dhuang/incubator-airflow,danielvdende/incubator-airflow,dhuang/incubator-airflow,sekikn/incubator-airflow,dhuang/incubator-airflow,apache/airflow,dhuang/incubator-airflow,danielvdende/incubator-airflow,cfei18/incubator-airflow,apache/incubator-airflow,nathanielvarona/airflow,apache/incubator-airflow,Acehaidrey/incubator-airflow,nathanielvarona/airflow,Acehaidrey/incubator-airflow,danielvdende/incubator-airflow,danielvdende/incubator-airflow,apache/airflow,cfei18/incubator-airflow,nathanielvarona/airflow,nathanielvarona/airflow,nathanielvarona/airflow,bolkedebruin/airflow,bolkedebruin/airflow,lyft/incubator-airflow,sekikn/incubator-airflow,Acehaidrey/incubator-airflow,mistercrunch/airflow,cfei18/incubator-airflow,bolkedebruin/airflow,sekikn/incubator-airflow,bolkedebruin/airflow,Acehaidrey/incubator-airflow,apache/airflow,lyft/incubator-airflow,Acehaidrey/incubator-airflow,mistercrunch/airflow,apache/airflow,nathanielvarona/airflow,lyft/incubator-airflow,apache/airflow,sekikn/incubator-airflow,danielvdende/incubator-airflow,cfei18/incubator-airflow,apache/incubator-airflow,Acehaidrey/incubator-airflow,danielvdende/incubator-airflow,mistercrunch/airflow,apache/incubator-airflow,lyft/incubator-airflow,bolkedebruin/airflow